NetBSD-5.0.2/share/examples/refuse/icfs/icfs.c
/*
* Copyright © 2007 Alistair Crooks. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fuse.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "virtdir.h"
#include "defs.h"
#ifndef PREFIX
#define PREFIX ""
#endif
#ifndef DEF_CONF_FILE
#define DEF_CONF_FILE "/etc/icfs.conf"
#endif
DEFINE_ARRAY(strv_t, char *);
static struct stat vfs; /* stat info of directory */
static virtdir_t tree; /* virtual directory tree */
static int verbose; /* how chatty are we? */
/********************************************************************/
/* convert a string to lower case */
static char *
strtolower(const char *path, char *name, size_t size)
{
const char *cp;
char *np;
for (cp = path, np = name ; (int)(np - name) < size ; np++, cp++) {
*np = tolower((unsigned)*cp);
}
return name;
}
/* add a name and its lower case entry */
static void
add_entry(virtdir_t *tp, const char *name, uint8_t type)
{
char icname[MAXPATHLEN];
char *root;
int len;
root = virtdir_rootdir(&tree);
len = strlen(root);
strtolower(&name[len], icname, sizeof(icname));
virtdir_add(tp, &name[len], strlen(name) - len, type, icname,
strlen(icname));
}
/* file system operations start here */
/* perform the stat operation */
static int
icfs_getattr(const char *path, struct stat *st)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
(void) memset(st, 0x0, sizeof(*st));
if (strcmp(path, "/") == 0) {
st->st_mode = S_IFDIR | 0755;
st->st_nlink = 2;
return 0;
}
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (stat(name, st) < 0) {
return -errno;
}
return 0;
}
/* readdir operation */
static int
icfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
virt_dirent_t *ep;
VIRTDIR *dirp;
char name[MAXPATHLEN];
(void) fi;
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if ((dirp = openvirtdir(&tree, ep->name)) == NULL) {
return -ENOENT;
}
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
while ((ep = readvirtdir(dirp)) != NULL) {
strtolower(ep->d_name, name, sizeof(name));
(void) filler(buf, name, NULL, 0);
}
(void) closevirtdir(dirp);
return 0;
}
/* open the file in the file system */
static int
icfs_open(const char *path, struct fuse_file_info *fi)
{
return 0;
}
/* read the file's contents in the file system */
static int
icfs_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info * fi)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
int fd;
int cc;
(void) fi;
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if ((fd = open(name, O_RDONLY, 0666)) < 0) {
return -ENOENT;
}
if (lseek(fd, offset, SEEK_SET) < 0) {
(void) close(fd);
return -EBADF;
}
if ((cc = read(fd, buf, size)) < 0) {
(void) close(fd);
return -errno;
}
(void) close(fd);
return cc;
}
/* write the file's contents in the file system */
static int
icfs_write(const char *path, const char *buf, size_t size, off_t offset,
struct fuse_file_info * fi)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
int fd;
int cc;
(void) fi;
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if ((fd = open(name, O_WRONLY, 0666)) < 0) {
return -ENOENT;
}
if (lseek(fd, offset, SEEK_SET) < 0) {
(void) close(fd);
return -EBADF;
}
if ((cc = write(fd, buf, size)) < 0) {
(void) close(fd);
return -errno;
}
(void) close(fd);
return cc;
}
/* fill in the statvfs struct */
static int
icfs_statfs(const char *path, struct statvfs *st)
{
(void) memset(st, 0x0, sizeof(*st));
st->f_bsize = st->f_frsize = st->f_iosize = 512;
st->f_owner = vfs.st_uid;
st->f_files = 1;
return 0;
}
/* "remove" a file */
static int
icfs_unlink(const char *path)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (unlink(name) < 0) {
return -errno;
}
/* XXX - delete entry */
return 0;
}
/* check the access on a file */
static int
icfs_access(const char *path, int acc)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (access(name, acc) < 0) {
return -errno;
}
return 0;
}
/* change the mode of a file */
static int
icfs_chmod(const char *path, mode_t mode)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (chmod(name, mode) < 0) {
return -errno;
}
return 0;
}
/* change the owner and group of a file */
static int
icfs_chown(const char *path, uid_t uid, gid_t gid)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (lchown(name, uid, gid) < 0) {
return -errno;
}
return 0;
}
/* "rename" a file */
static int
icfs_rename(const char *from, const char *to)
{
#if 0
char fromname[MAXPATHLEN];
char toname[MAXPATHLEN];
virt_dirent_t *ep;
if ((ep = virtdir_find_tgt(&tree, from, strlen(from))) == NULL) {
return -ENOENT;
}
(void) snprintf(toname, sizeof(toname), "%s%s", dirs.v[0], to);
if (!mkdirs(toname)) {
return -ENOENT;
}
if (rename(fromname, toname) < 0) {
return -EPERM;
}
#endif
return 0;
}
/* create a file */
static int
icfs_create(const char *path, mode_t mode, struct fuse_file_info *fi)
{
virt_dirent_t *ep;
char *slash;
char name[MAXPATHLEN];
int fd;
if ((slash = strrchr(path, '/')) == NULL) {
return -ENOENT;
}
if ((ep = virtdir_find_tgt(&tree, path, (int)(slash - path) - 1)) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s%s", virtdir_rootdir(&tree), ep->name, slash);
if ((fd = open(name, O_RDWR | O_CREAT | O_EXCL, 0666)) < 0) {
return -EPERM;
}
(void) close(fd);
add_entry(&tree, name, 'f');
return 0;
}
/* create a special node */
static int
icfs_mknod(const char *path, mode_t mode, dev_t d)
{
virt_dirent_t *ep;
char *slash;
char name[MAXPATHLEN];
if ((slash = strrchr(path, '/')) == NULL) {
return -ENOENT;
}
if ((ep = virtdir_find_tgt(&tree, path, (int)(slash - path) - 1)) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s/%s", virtdir_rootdir(&tree), ep->name, slash + 1);
if (mknod(name, mode, d) < 0) {
return -EPERM;
}
add_entry(&tree, name, ((mode & S_IFMT) == S_IFCHR) ? 'c' : 'b');
return 0;
}
/* create a directory */
static int
icfs_mkdir(const char *path, mode_t mode)
{
virt_dirent_t *ep;
char *slash;
char name[MAXPATHLEN];
if ((slash = strrchr(path, '/')) == NULL) {
return -ENOENT;
}
if ((ep = virtdir_find_tgt(&tree, path, (int)(slash - path) - 1)) == NULL) {
return -EEXIST;
}
(void) snprintf(name, sizeof(name), "%s/%s/%s", virtdir_rootdir(&tree), ep->name, slash + 1);
if (mkdir(name, mode) < 0) {
return -EPERM;
}
add_entry(&tree, name, 'd');
return 0;
}
/* create a symbolic link */
static int
icfs_symlink(const char *path, const char *tgt)
{
virt_dirent_t *ep;
char *slash;
char name[MAXPATHLEN];
if ((slash = strrchr(path, '/')) == NULL) {
return -ENOENT;
}
if ((ep = virtdir_find_tgt(&tree, path, (int)(slash - path) - 1)) == NULL) {
return -EEXIST;
}
(void) snprintf(name, sizeof(name), "%s/%s/%s", virtdir_rootdir(&tree), ep->name, slash + 1);
if (symlink(name, tgt) < 0) {
return -EPERM;
}
add_entry(&tree, name, 'l');
return 0;
}
/* create a link */
static int
icfs_link(const char *path, const char *tgt)
{
virt_dirent_t *ep;
char *slash;
char name[MAXPATHLEN];
if ((slash = strrchr(path, '/')) == NULL) {
return -ENOENT;
}
if ((ep = virtdir_find_tgt(&tree, path, (int)(slash - path) - 1)) == NULL) {
return -EEXIST;
}
(void) snprintf(name, sizeof(name), "%s/%s/%s", virtdir_rootdir(&tree), ep->name, slash + 1);
if (link(name, tgt) < 0) {
return -errno;
}
add_entry(&tree, name, 'f'); /* XXX */
return 0;
}
/* read the contents of a symbolic link */
static int
icfs_readlink(const char *path, char *buf, size_t size)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (readlink(name, buf, size) < 0) {
return -errno;
}
return 0;
}
/* remove a directory */
static int
icfs_rmdir(const char *path)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (rmdir(name) < 0) {
return -errno;
}
/* XXX - delete entry */
return 0;
}
/* truncate a file */
static int
icfs_truncate(const char *path, off_t size)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (truncate(name, size) < 0) {
return -errno;
}
return 0;
}
/* set utimes on a file */
static int
icfs_utime(const char *path, struct utimbuf *t)
{
virt_dirent_t *ep;
char name[MAXPATHLEN];
if ((ep = virtdir_find_tgt(&tree, path, strlen(path))) == NULL) {
return -ENOENT;
}
(void) snprintf(name, sizeof(name), "%s/%s", virtdir_rootdir(&tree), ep->name);
if (utime(name, t) < 0) {
return -errno;
}
return 0;
}
/* operations struct */
static struct fuse_operations icfs_oper = {
.getattr = icfs_getattr,
.readlink = icfs_readlink,
.mknod = icfs_mknod,
.mkdir = icfs_mkdir,
.unlink = icfs_unlink,
.rmdir = icfs_rmdir,
.symlink = icfs_symlink,
.rename = icfs_rename,
.link = icfs_link,
.chmod = icfs_chmod,
.chown = icfs_chown,
.truncate = icfs_truncate,
.utime = icfs_utime,
.open = icfs_open,
.read = icfs_read,
.write = icfs_write,
.statfs = icfs_statfs,
.readdir = icfs_readdir,
.access = icfs_access,
.create = icfs_create
};
/* build up a virtdir from the information in the file system */
static int
dodir(virtdir_t *tp, char *rootdir, const char *subdir)
{
struct dirent *dp;
struct stat st;
struct stat dir;
struct stat f;
struct stat l;
char icname[MAXPATHLEN];
char name[MAXPATHLEN];
char type;
DIR *dirp;
int len;
if (tp->v == NULL) {
(void) stat(".", &dir);
(void) memcpy(&f, &dir, sizeof(f));
f.st_mode = S_IFREG | 0644;
(void) memcpy(&l, &f, sizeof(l));
l.st_mode = S_IFLNK | 0755;
virtdir_init(tp, rootdir, &dir, &f, &l);
virtdir_add(tp, "/", 1, 'd', "/", 1);
}
(void) snprintf(name, sizeof(name), "%s/%s", rootdir, subdir);
if ((dirp = opendir(name)) == NULL) {
warn("dodir: can't opendir `%s'", name);
return 0;
}
len = strlen(tp->rootdir);
while ((dp = readdir(dirp)) != NULL) {
if (strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
continue;
}
(void) snprintf(name, sizeof(name), "%s%s%s%s%s", rootdir, (subdir[0] == 0x0) ? "" : "/", subdir, "/", dp->d_name);
if (stat(name, &st) < 0) {
warnx("can't stat `%s'", name);
continue;
}
switch (st.st_mode & S_IFMT) {
case S_IFDIR:
type = 'd';
break;
case S_IFREG:
type = 'f';
break;
case S_IFLNK:
type = 'l';
break;
case S_IFBLK:
type = 'b';
break;
case S_IFCHR:
type = 'c';
break;
default:
type = '?';
break;
}
if (!virtdir_find(tp, &name[len], strlen(name) - len)) {
strtolower(&name[len], icname, sizeof(icname));
virtdir_add(tp, &name[len], strlen(name) - len, type, icname,
strlen(icname));
}
if (type == 'd') {
dodir(tp, rootdir, &name[len + 1]);
}
}
(void) closedir(dirp);
return 1;
}
int
main(int argc, char **argv)
{
int i;
while ((i = getopt(argc, argv, "f:v")) != -1) {
switch(i) {
case 'v':
verbose = 1;
break;
}
}
#if 0
(void) daemon(1, 1);
#endif
dodir(&tree, argv[optind], "");
return fuse_main(argc, argv, &icfs_oper, NULL);
}